Improved automatic circuit-closer for electro-magnetic burglar-alarms



Electro-Magnetic- Burglar-Alarm., No. 107,301. Patented sept. 13, 1870.

n on" UNITED STATES PATENT OEEIcE.

JAMES P. SNYDEB, OF BROOKLYN, NE\V YORK.

IMPROVED AUTOMATIC CIRCUIT-CLOSER FOR ELECTRO-MAGNETIC BURGLAR-ALRMS.

Specification forming part o f Let-ters Patent No. 107,301, dated September I3, 1870.

To all whom fit may concern:

Be it known that I, JAMES I). SNYDER, of the city of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Automatic Electro-Magnetic Indicator; and I do hereby declare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part oi' this specication.

This invention relates to improvements in magnetic apparatus for sounding alarms in buildings when windows or doors are opened by burglars for unlawfully entering them; and consists in an improved arrangement of apparatus for setting a secondary current in action by means of the current iirst set in action by the movement of the door or window, which secondary current cannot'be broken again except by the person in charge, so that the burglar, having once set the alarm in action, cannot stop it to prevent exposure thereby.

Figure l is a plan view of my improved apparatus, and Fig. 2 is a tranverse sectional elevation of the same.

Similar letters of reference indicate corresponding parts.

A is a wire connecting one pole of a voltaic battery, A1, with a at spring, B, secured to the bottom of a box or case, AZ, near one end. B1 is another spring, attached to the bottom of said box in front of spring B, and having a tendency to spring away from the top of said spring B. This spring is connected to the other pole ofthe battery through the medium of the wire B2, switch C, spring D, wire E, coils El, wires F4, and switch I?.

G is a lever, attached to an armature, G, which will be attracted when this circuit is closed and a current established through it by causing the spring Bl to bear against B. The end of this lever G, opposite the armature, is provided with a rod, G2, which projects through a notch in the end of the box, and falls into a notch in a plate, K, pivoted eccentrically on the outside of the end of the box. Vhen the lever is raised the plate will swing around on its spindle or support L, which projects through a tube, Ll, into the inside of the box, where a bellcrank, L2, is connected to it, so as to turn with it. The short arm of this bell-crank has a block of non-conducting substance, L3, attached 'to it. rlhis block bears against the spring Bl when the plate K is held up by the lever G2, and presses it against a spring, B, so that the above-described circuit will be complete. At the same time the long arm L4 projects along the side of thel end of the box, in front of a spring, I, attached to the said end, and projecting downward and outward from it, so that when the lever G2 is raised and the plate K and arm L4 fall the latter will strike against the spring I, and a new circuit will be opened through spring B1, arm L4, spring I, and a wire, M, the latter connecting spring I with the wire A, the falling of the plate K releasing the spring B1 from B, and bringing the arm L4 against the top of spring B1. A wire, N, connects the tube Ll oi' the spindle L with an electro-magnetic alarm, (vibrating armature.) A wire, O, connects the wire M with the alarm, and a wire, Q, is connected with the alarm at one end, and with switch P and wire .F at the other end.

The operation is as follows: The wire A, leading from the battery to the spring B, is separated between the battery and spring B at any point, as at X, which may be considered a window or door, where, if attempts be made to raise the window or open the door, the two separated ends will be brought into contact, whereby an electrical circuit will be established (the switches being closed and the plate K being held up by the rod Gr2 of the lever G). through the wire A, springs B B1,

switch C, springs D, wires E F', and switch I- to the opposite pole of the battery.

During this circuit of the electricity the armature G1 will be attracted by the magnet, and the rod G2 raised out of the notch in plate K, letting it fall, by which the springs B and Bl become separated, cutting off this circuit, and the arm E4, falling against the spring I and against the top of spring B, opening another circuit through wire M, spring I, arm L4, tube L1, wire N, through the alarm-switch P and wire F, and back to the battery, which will keep the alarms in action until stopped by the attendant by replacing plate K or breaking the connection at switch P, whether the connection at X be broken again or not.

In the ordinary indicators for electrical purposes and alarms the making and breaking of the circuit and sounding of thealarm is only continued while such circuit is closed at the point where it was rst made; but this indicator automatically establishes another circuit the instant that the first is established, which cannot be broken again by breaking the first, the said second circuit passing from one pole of the battery to the other one, and, through the magnet, causing a continuous ringing ot' a bell with a vibrating armature.

It is manifest that instead ot' arranging the springs B B1 so as to spring away from each other, and the bell-crank L2 and block L3 to hold them together when set for closing the iirst circuit, and allowing them to separate when the plate K falls, I may arrange the springs to bear against cach other by their own action, and place a T on the end ot' the spindle, to strike againsteach spring and separate them when the plate K falls. The same results may be produced by this arrangement,

which does not differ from the other except in the order of the arrangement ot' the springs and the action ot the attachment to the spin dle L on them.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination ot' springs B B1, bellcrank LZ, and springs 1, as and for the purpose described. V

2. The combination ot the springs B Bl, connected 'with the battery and the magnet, as described, the dropping plate K, lever G G2, bell-crank L2, and spring I, the said spring l and the crank L2 being connected with wires M and N, and through them with the alarm and the battery, all substantially as specicd.

The above specification of my invention Signed by me this 5th day of May, 1870.

JAMES l?. SNYD'ER.

Witnesses:

Gmo. W. MABEE, 'WARREN i. Prim. 

